Encoder
US6989771B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 2004 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Nov 3, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/308
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An encoder includes comparators CP4 and CP5 which are provided in such a manner as to correspond to phase A and B respectively and detect a state where the output voltages deviate from their normal ranges. Transistors TR4 and TR5 which operate according to the outputs of the respective corresponding comparators are connected through resistors R8 and R18, respectively, to an output line of phase Z. When each output line connecting to a phase-A output terminal QA or a phase-B output terminal QB is short-circuited to ground, or a signal line 41A or 42B connecting the output terminal with a electronic control unit 40 is broken, the transistor TR4 or TR5 is turned on and the output of phase Z falls below its normal range, thereby a malfunction is detected. Even if one of the transistors of phase A and phase B breaks down, a malfunction in the other phase is transmitted to phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.